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 I was looking for a YouTube demonstration of the idea you mentioned above. I posted the wrong link Bob.


 I was hoping to find a video done by MFJ, and I found a boat-load of coax discussions and demonstrations, but nothing from MFJ that really discussed making tuned 1/2 wavelength lines for antenna tuning. 


The video below, more or less, shows the technique you suggested, using a dummy load, a T connector, and in this case an MFJ 249 analyzer.


[MEDIA=youtube]id=MaRkqDoBWSs;t=284[/MEDIA]